Schematics

A diagram from <n>James Clerk Maxwell</n>'s 1873 book, <n>A Treatise on Electricity and Magnetism</n>.

A 1969 drawing of the <n>Soundcube</n> sound installation by artist <n>Bernhard Leitner</n>.

Patent drawing for the <n>Alternating Current Clock</n>, invented by <n>Laurens Hammond</n> in 1929.

Hammond electric clock patent illustrations

A 1894 patent drawing for compasses, invented by <n>Milton Bradley</n>.

Patent drawing for the <n>Anti-Gravity Pen</n>, invented by <n>Paul C. Fisher</n> and granted in 1966.

The Fisher Space Pen Boldly Writes Where No Man Has Written Before